Last week while cleaning the car the USB lead off my sat nav went into the cigarette lighter and sparked. Automatically changed the fuse but no joy so tonight changed the socket itself but still no joy!!! Any ideas on what I could try next as it's starting to drive me mad!!!!

Aahh no one has mentioned that before, are they visible to see if they've blown like the blade ones or do they have to be metered? Are they the smallish square ones in the fuse box behind the glove box?

Thanks fordtech thumbs up!!! Just picked up a fuse and it's working a treat. Thumbs down to ford for trying to convince me to give them the car for a couple of days to "diagnose" the problem at expense!!!! £3.00 fix. Thanks again mate.